QFileDialog::getOpenFileName() hangs in Windows when using the native dialog
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Hi,
I'm using QT 5.3.1 and I noticed that my program hangs in Windows 7 (64bit) with following arguments to the function.
QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),
"/home",
tr("Images (*.png *.xpm *.jpg)"));However, if I use the option QFileDialog::DontUseNativeDialog, then it won't hang and will show the non-native file open dialog. I would prefer to use the native windows dialog so can anyone tell me if this is a bug or not?
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Hi and welcome to devnet,
Strange but are you aware that you are trying to open a probably non existent folder ? There's no /home on windows. However you can use QDir::home() to get the current user home path
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Do you have any network drive ?
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Which version of Windows ?
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It is Windows 7 Professional (64bit).
Looking at the history of Qt, I think this possibly has been a bug for some time (possibly since QT4)....
I have seen at least 1 reported case of this sort of behaviour....[quote author="SGaist" date="1418678949"]Which version of Windows ?[/quote]
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I have just recently migrated a project I am working on to Qt5.4.1 from Qt4.8.5, and I am having the same problem as reported by kasunf.
A call to getOpenFileName hangs - using QFileDialog::DontUseNativeDialog gets it working, but I'll prefer to use te native windows dialog. The code snippet is shown below:
m_imageFile = QFileDialog::getOpenFileName(this, tr("Open Image"), QDir::homePath(), tr("Image Files (*.png *.jpg *.bmp)"), 0, QFileDialog::DontUseNativeDialog); //works
m_imageFile = QFileDialog::getOpenFileName(this, tr("Open Image"), QDir::homePath(), tr("Image Files (*.png *.jpg *.bmp)")); //does not work
Program control does not seem to return from this function call. Has this issue been resolved? My system specifications are as follows:
Windows7 64bit
Visual Studio 2010
Qt5.4.1_openglPS: I did not have this problem with Qt4.8.5
Thanks,
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Do you mean that when you click OK the dialog disappear but your application doesn't do anything ?
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@SGaist Nope, that is not what I mean.
The open fIle dialog does not appear at all - as though my application is waiting for it to appear. After investigations it turns out that it seems to hang in the call to
QFileDialog::getOpenFileName(...)
As I indicated, a call to QFileDialog::getOpenFileName(...) using the flag QFileDialog::DontUseNativeDialog returns from the function call, but the same function call without using the flag does not return.
I will like to use it without the flag. Also, I didn't have this problem in Qt4.8.5.
Please this is the same problem as first reported on this post. I just need to know what the status of this issue is.
PS: I am interested in purchasing a commercial license for Qt5, but I need to make sure that my project works in Qt5 before going ahead with the purchase.
Thanks,
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Which compiler are you using ? Just tested with VS2013 on Win 8 and no problem with the dialog.
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win 7. 64 bit, Qt 5.5, "gcc"
No hanging at all.
So maybe only VS?Please Try with QFileDialog::DontUseCustomDirectoryIcons
As i had case where it would take ages due to subversion overlay icons. -
Just to note this issue still exists, but does not happen on all QFileDialogs instances used in our software.
When does it work:
On the very first start-screen, when no other backend-threads are running, no COM connection is created etc.
When does it not work
Some where later in the application, when backend-threads are running, COM connection to a different application is established.
Setup:
Qt 5.12.3
MSVC 2017 v15.9.7
Windows 10 build1809The issue is reproducible on different computers in Debug and Release Build
Observations
Opening The QFileDialog leads to the following:
The Main-UI is blocked and you can hear the windows-sound that comes, when the UI is blocked because a Dialog is in front and the user clicks somewhere on the Main-UI.
Then
Switching between applications (Alt-Tab) then hitting ESC, and the Main-UI is responsible again.
This indicates, that there is an invisible Dialog on top of the main-UI.Opening The QFileDialog again
Then it works!
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Same symptoms here, with QFileDialog::getExistingDirectory.
- Before loading the COM objets, the dialog opens well, with native window.
- After laoding COM (CoInitializeEx), calling getExistingDirectory causes the program to hang.
- After disconnecting COM (CoUninitialize), the dialog opens well again, but with Qt window (not native) even though I did'nt specify the DontUseNativeDialog option!
Qt 5.12.1, MSVC 2017, Windows 10
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Clearly nasty COM behaviour. I am not a Qt expert, but since your post and the previous one are nice and clear on the reproducibility, the best would be to (search first and then) report them at https://bugreports.qt.io/secure/Dashboard.jspa, see also https://wiki.qt.io/Reporting_Bugs.
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Yeah I am encountering the same problem in 2024. This condition is also caused by QSplitter for some reason. Setting my "central" widget to QSplitter just causes it to permanently block a thread for some reason. But somehow setting the don't use native dialog option allows me to open it. If you have some suggestion for me do tell as I am a complete noob
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We encountered this problem years ago. And this was caused by programs from DELL, "Dell Backup and Recovery", "Dell Optimizer", "Dell Power Management". These programs use Qt too, even statically compiled, but in a nasty way that prevented using newer Qt versions. And it crashed our software when you open a file dialog using native dialog on windows. Problems were solved once these programs were uninstalled.
